wildlife – nature – travel

Filed Under: Lenses

Quick field review of the Sigma TC1401 teleconverter on the Sigma 150-600mm Sports with sample shots taken with a Nikon D800

This 1.4 times converter changes the lens to a 210-840mm f/7.1-9.0 super telephoto. It adds 40% in reach, 1 f/stop loss in aperture and adds an additional 190 g in weight, which takes the lens to 3.05Kg. What I wanted to confirm was:
Is it usable early in the morning at first light
Is the autofocus able to lock on subjects fast and reliably, including birds in flight
Are the resultant images still sharp enough? ... Read more